Corner-bead.



G. S. KNAPP.

.GORNER BEAD.

Patented Jan. 7, 1913.

G. S. KNAPP.

CORNER BEAD. APPLIGATION IILED JUNE 5, i912.

Patented J an. 7, 1913.

2 SHEETS-SHEET 2.

ZQLZ' mesa/ 5'" UNITED sratrns PATENT carton.

GEORGE S. KNAPP, OF LA Gl tANGE, ILLINOIS, ASSIGNOR 'IO KNAPP BROTHERS MANUFACTURING COMPANY, A CORPORATION OF ILLINOIS.

CORNER-READ.

Specification of Letters Patent. Application filed June 5, 1912. Serial No. 701,806.

To all whom it may concern: Be it known that I, GEORGE S. KNAPP, a citizen of the United States, residingat La| Grange, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Corner-Beads, of which the following is a specification.

My invention relates to im rovements in corner beads, or grounds or plasterers work.

One of. the objects of my invention is v to provide a bead, or straight. line edge, or

. A s ecific object of my invention i'sto pro strip, to be fastened to the corner of a wall to be plastered, thereby to provide a ground, or gage to which theplasterer mayfinish his work and a metallic faced corner to impart strength and durability to this portion of the plastered structure. I

vide, 1n a corner head, or ground, longitudinally corrugated and perforated side wings, each terminating'in fiat marginal nail-re ceiving edges, substantially at right angles to each other, thereby producing a stronger structure than otherwise, and leaving spaces between the perforated, distended, and corrugated portion and the angular'support, or wall, to which the strip is to be nailed, into which the plaster will be keyed.

Another object of my invention is to provide, in a corner bead, alternate, elongated slots, and nail-receiving holes, the formerbeing specially well adapted for use with brick or tile wall structures so that attaching nails may be driven through said slots, into the mortar between the bricks, or tiles, and an occasional nail may be driven through the smaller perforations to prevent longitudinal displacement of the strip.

Other and further objects'of my invention will become readily apparent to persons skilled in the art from a consideration of the following descriptions when taken into con- The strip, orground, is made of a single piece of sheet metal folded longitudinally upon itself to provide, at the juncture of the folded portion, a straight edge forming a ground to which the plasterer may finish his work, at the corners of plastered structures to give the plastered structure a neat and. true line appearance. The folded portion may be formed to a fin, or head, as preferred, from which there extend, at substantial right angles to each other two wings, that are to be attached to the structure to be directly plastered. p

In Sheet 1 the preferred form of bead is illustrated and on Sheet 2 a slight modification is shown. In referring to the two difcharacters to indicate the same parts adding a only the exponent prime to the parts illustrated in Figs. 4, 5 and 6.

:10 is a bead, presenting a rounded transverse outer surface and an elongated straight surface to provide the ground, or gage to which the plasterer may finish his work and further to provide means for straightening the plastered structure at the corners. In

the illustrations, the side wings 11 and 12,

are at ,substant-ial right angles to each other, but when it is desirable to have a thicker coating of plaster, the wings may be drawn toward efach other at a slighter angle and a bead or finishing surface will then be projected farther, from the corner as is well understood in the use of beads in structures of this general character. 'The nail-receiving surfaces 13, and 14, are substantially flatand furthermore they are substantially at right angles to each other,'.when the strip is applied to a substantially square corner.

If the entire strip were flat, between the nail-receiving surfaces, and the fin joining the wings, the plaster 15, would not be held so securely in place, although the formation of the bead, 10, is such, as at 16, as to hold the plaster in place. However, I prefer to corrugate the strip or wings, asat' 17, for two reasons: One of the reasons is that the strip is thereby given greater strength, and when being handled, before it is nailed to the structure, it will not buckle upon itself, and by perforating the corrugated portions, or the portions extending away from the wall, as at 17, the plaster will key through the perforations, such as shown at 18, and will be firmly retained.

Patented Jan. 7, 1913.

,ferent forms I shall use the same reference l in place by that portion of the plaster which will be forced under. the solidportion, as at 19, when the plaster is being applied.

It will be observed that the corrugations 17, are curved gradually from the nailreceiving fiat portions 13, and 14, to the inturned portions 16. These corrugations, however, may be made more abrupt as shown in the modification at 17 In each wing, 11 and 12, in the nail-receiving portions thereof, I provide elongated slots 20, alternating with round perforations 21. These slots are provided so that when the strip is used with a brick or tile wall, the nails may be driven, through the slots into the plaster between the bricks or tiles, and the smaller perforations 21, are

made for insertion of nails so as to preventany longitudinal displacement of the strips,

as a whole. It will not be necessary to insert a nail in each perforation 21, as a nail in an occasional hole, of this character, will be suflicient. Nails 22, are preferably used which have relatively large heads so as to overlie the borders of )the elongated slots.

My improved head has greater strength, due to the corrugations, before and after its application to the wall, and therefore, a head of equal strength may be made of much thinner stock, whereby its value is preserved and its cost of production is greatly reduced, and the strength of the bead, having the corrugations, with a given thickness of stock, is very greatly enhanced. The corrugations also serve as an additlonal means for securing the plaster to the wall, near the corner of the plastered wall where the plaster is subjected to very much greater wear and tear, than is other portions of the plastered structure.

I have shown herein two specific forms of my invention, but it is apparent to per sons skilled in the art, that the invention may take other forms than those shown in the drawings, as, for instance, a" greater number of corrugations ma be used, if necessary or desirable, than t ose shown, and

t it may take still different forms, from the two which I have herein illustrated, without departing from the scope of the appended claims, Y 1

Having thus described my invention-,what I claim as new and desire to secure-by Letters Patentof the'United States is:

1. A corner beads tructuremade of a strip of metal folded longitudinally upon itself to provide a finishing edge or bead having a narrowed throat, and side wings extending from said throat at substantial right angles for coaction respectively with the right angle surfaces of the wall, each said wing comprising two separated longitudinal wall-engaging portions separated by a perforated outwardly bowed corrugation. 1

2. A corner bead structure made of a strip folded. longitudinally upon itself to provide a finishing edge or bead having a fold, said bead having a narrow throat and side Wings extending from the throat of said head at substantial right angles for coaction respectively with the right-angle surfaces of a wall formed of brick, each said wing having therein a perforation to receive a nail driven therethrough between two of the bricks of said wall, and each wing having also a slot extending longitudinally to overlie at least one of the spaces between .two other bricks of the wall in any position of the bead with respect thereto determined by the positioning of said perforation over said first space between bricks of the wall,'for purposes described.

4. A corner'bead structure made of a strip folded longitudinally to provide a finishing bead having a narrow throat and wings extending outwardly at right angles from said throat, each wing consistingof two longitudinal wall-engaging portions separated by a perforate outwardly bulged GEORGE S. KNAPP.

In the presence of W. LINN ALLEN, Mair 

